College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem …
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can you please give me the solution for 1.22, thanks

degrees on a tem- the giav is g Chapter 1 5IC Principles, Concepts and Definition reading on this scale is a certain number of degrees on a corresponding absolute tem- perature Scale. What is this absolute tem- 26 Sity is 62 1 lb/it'. (c) Answer (a) and (b) (c) Answer (a) and (b) jí Problems Open perature at 0°N? Ans. (a) IN = 91e + 100, (b) 2360°N abs, A 67 approx. 1.19 A weatherman carried an aneroid barometer from the ground floor to his office atop the Sears Tower in Chicaga. desired ta al) versus equatoria variation a given r weight va height of 1.30 barometer 25" read 30.150 in. Hg abs; topside it read 28.607 in. Hg abs. Assume that the average atmcspheric air density was 0.075 lb/ft' and estimate the height of the building. On the ground level, the readings and K i: Problam 1.22 Ans. 1451 ft (approx.). that will Ans. (a) 26.90, 26.90, (b) 25.46, 26.90, (c) illustrated, mercury 1.20 As manometer is attached to the side of a nearly 26.10 psia. full water tank. The reading of the mercury column is 15.5 in. Hg gage. Although air on the water maintains the pressure, the other 10-in. leg of the manometer is full of water; for H¿O, p = for Hg, p 846 lb/ft. If the location is at standard gravity and the temperature of both the the temperature of the fluid expressed as °R water and mercury is 60°F, what is the pres- sure (psia) in the tank at the level where the manometer is attached? If the tank extends 10 ft below this level, what is the pressure at this depth? 1.23 Convert (a) 122°F to °C and to K. (b) -40°C to °F and to °R, (c) 942°R to °C. 1.31 weight and to K, (d) 373 K to °F and to °R. 1.24 A Fahrenheit and a Celsius ther- mometer are both immersed in a fluid and indicate identical numerical readings. What is back? 1 62.3 lb/ft’; in dyne 1.32 depenc State sapuno and as K? 1.25 The same as problem 1.24 except that the Fahrenheit reading is numerically twice that of the Celsius reading. that is Ans. 21.94, 26.27 psia. Ans. 780°R, 433 K. 1.26 Steam at a pressure of 150 psia and a temperature of 400°F occupies a volume of 3.223 ft/lb. (a) What is its density in lb/ft and in slugs/ft? (b) Convert the pressure to in. Hg and ft water (60°F). (c) Convert the temperature to °R, K, and °C. Is temperature an intensive or an extensive property? Ans. (a) 0.31 lb/ft', 0.00965 slugs/ft'; (b) 306 in. Hg. 346 ft w.; (c) 860°R, 478 K. 15.5 10 in. Hg Problem 1.20 204.4°C. 1.21 A 51-ft' tank contains 3 lb of a gas at 80°F and a vacuum pressure of 24 in. Hg. (a) What is the absolute pressure in psia and psfa? (b) What is the gas' specific volume and density? (c) What is its temperature in °C, °R, and °K? Ans. (a) 418 psfa, (b) 0.0588 lb/ft', (c) 299.7 K. 1.27 A fluid moves in a steady flow manner between two sections in a flow line. At section 1: A, = 1 sq ft, vi = 1000 fpm, v, = 4 ft'/lb. At section 2: Az = 2 ft', p2 = 0.20 lb/ft. Calculate (a) the flow (Ib/hr) and (b) the velocity (fps) at section 2. %3D %3D %3D 1.22 A simple mercury manometer con- nected into a flow line gives readings as shown in the figure. L.ocal gravity is standard and the mercury density is 0.488 lb/in.' Find the pressure at points X and Y when the flow line and left leg contain (a) air whose density is 0.072 lb/ft', (b) water whose den- Ans. (a) 15,000 lb/hr, (b) 10.42 fps. 1.28 A 10-ft diameter by 15-ft height vertical tank is receiving. water p 62.1 lb/ft') at the rate of 300 gpm and is discharging through a 6-in. ID line with a constant velocity of 5 fps. At a given instant. the tank is half full. Find the water level and the mass change in the tank 15 min later. Ans. 3.90 ft. 17,550!5 =
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Transcribed Image Text:degrees on a tem- the giav is g Chapter 1 5IC Principles, Concepts and Definition reading on this scale is a certain number of degrees on a corresponding absolute tem- perature Scale. What is this absolute tem- 26 Sity is 62 1 lb/it'. (c) Answer (a) and (b) (c) Answer (a) and (b) jí Problems Open perature at 0°N? Ans. (a) IN = 91e + 100, (b) 2360°N abs, A 67 approx. 1.19 A weatherman carried an aneroid barometer from the ground floor to his office atop the Sears Tower in Chicaga. desired ta al) versus equatoria variation a given r weight va height of 1.30 barometer 25" read 30.150 in. Hg abs; topside it read 28.607 in. Hg abs. Assume that the average atmcspheric air density was 0.075 lb/ft' and estimate the height of the building. On the ground level, the readings and K i: Problam 1.22 Ans. 1451 ft (approx.). that will Ans. (a) 26.90, 26.90, (b) 25.46, 26.90, (c) illustrated, mercury 1.20 As manometer is attached to the side of a nearly 26.10 psia. full water tank. The reading of the mercury column is 15.5 in. Hg gage. Although air on the water maintains the pressure, the other 10-in. leg of the manometer is full of water; for H¿O, p = for Hg, p 846 lb/ft. If the location is at standard gravity and the temperature of both the the temperature of the fluid expressed as °R water and mercury is 60°F, what is the pres- sure (psia) in the tank at the level where the manometer is attached? If the tank extends 10 ft below this level, what is the pressure at this depth? 1.23 Convert (a) 122°F to °C and to K. (b) -40°C to °F and to °R, (c) 942°R to °C. 1.31 weight and to K, (d) 373 K to °F and to °R. 1.24 A Fahrenheit and a Celsius ther- mometer are both immersed in a fluid and indicate identical numerical readings. What is back? 1 62.3 lb/ft’; in dyne 1.32 depenc State sapuno and as K? 1.25 The same as problem 1.24 except that the Fahrenheit reading is numerically twice that of the Celsius reading. that is Ans. 21.94, 26.27 psia. Ans. 780°R, 433 K. 1.26 Steam at a pressure of 150 psia and a temperature of 400°F occupies a volume of 3.223 ft/lb. (a) What is its density in lb/ft and in slugs/ft? (b) Convert the pressure to in. Hg and ft water (60°F). (c) Convert the temperature to °R, K, and °C. Is temperature an intensive or an extensive property? Ans. (a) 0.31 lb/ft', 0.00965 slugs/ft'; (b) 306 in. Hg. 346 ft w.; (c) 860°R, 478 K. 15.5 10 in. Hg Problem 1.20 204.4°C. 1.21 A 51-ft' tank contains 3 lb of a gas at 80°F and a vacuum pressure of 24 in. Hg. (a) What is the absolute pressure in psia and psfa? (b) What is the gas' specific volume and density? (c) What is its temperature in °C, °R, and °K? Ans. (a) 418 psfa, (b) 0.0588 lb/ft', (c) 299.7 K. 1.27 A fluid moves in a steady flow manner between two sections in a flow line. At section 1: A, = 1 sq ft, vi = 1000 fpm, v, = 4 ft'/lb. At section 2: Az = 2 ft', p2 = 0.20 lb/ft. Calculate (a) the flow (Ib/hr) and (b) the velocity (fps) at section 2. %3D %3D %3D 1.22 A simple mercury manometer con- nected into a flow line gives readings as shown in the figure. L.ocal gravity is standard and the mercury density is 0.488 lb/in.' Find the pressure at points X and Y when the flow line and left leg contain (a) air whose density is 0.072 lb/ft', (b) water whose den- Ans. (a) 15,000 lb/hr, (b) 10.42 fps. 1.28 A 10-ft diameter by 15-ft height vertical tank is receiving. water p 62.1 lb/ft') at the rate of 300 gpm and is discharging through a 6-in. ID line with a constant velocity of 5 fps. At a given instant. the tank is half full. Find the water level and the mass change in the tank 15 min later. Ans. 3.90 ft. 17,550!5 =
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